Cutting-tool holder.



J. C. BRUNO.

CUTTING TOOL HOLDER.

APPLzcATmN FILED 1111111.15, 1911.

1,293,68L Peeemed m1111919.

2 SHEETS-SHEET l.

J. C. BRUNO.

CUTTING TOOL HOLDER.

APPLICATION FILED MAR'. I5. 1917.

1,293,687. Patented Fe1i.11,1919.

2 SHEETS-SHEET 2e JOSEPH o. BRUNO, or BUFFALO, NEW YORK.

CUTTING-TOOL HOLDER.

Specification of Letters Patent. Y

Patented rebgii, 191e.

Application filed March 15, 1917. Serial No. 154,946.

To all whom z' may concern:

Be it known that I, JOSEPH C. BRUVNo, a citizen of the United States, residing at Buffalo, in the county of Erie and State ofA New York, have invented certain new and useful Improvements in Cutting-Tool Holders, of which the following is a specication.

My invention relates 'to a cutting-tool holder, and more particularly to a tool for working out slots and other openings.

Owing to the construction of tool holders as now applied to shaping and similar machines, certain kinds of work will oftentimes be encountered which requires the construction of special tools, which tools are necessarily forged to angular shapes and are of considerable lengths in order to bring the cutting portion of the tool at the vdesired point of the work while leaving suicient room between the work and the tool head to allow said head and the ram carrying the same the necessary freedom in action; but such specially formed tools, owing to their length and angular shapes, are flexible and therefore unreliable since they cannot be depended upon to make a true cut, particularly for the reason that they have a propensity to vibrate and chatter while moving in contact with the work during their cutting strokes.

One of the objects of my invention is to eliminate the undesirable features of the tools last above referred to, and to construct a holder which will enable the operator of a shaping 0r similar machine to out slots and perform other operations in or on work pieces, particularly die cutting operations, which tool holders of the present day constructions are not adapted for, except with the use of specially constructed tools having the objections above noted.

Another object of my invention is the provision of a tool holder wherein the cutting tool projects forwardly beyond 'any portion of the holder, or any portion of the machine to which the holder may be attached, so that a tool carried by said holder will reach points or parts of a work piece inaccessible to the tools of ordinary holders.

A further object of my invention is to provide a tool holde having means for conveniently securing aV tool in place, which means also permits quick and ready removal of the tool from the holder.

A further object is to provide a tool holder adapted to be attached to the pivoted apron r of a shaping or similar machine and which 1s equipped with adjustable meanspto permit the pivoted apron to swing on its swivel head to a limited degree only during the idle or return stroke of said tool holder; Y

the adjustability of said means permitting the tool holder to be attached toany lform o f shapingV or similar machine without limitations in its functions.

A still further object of my invention is the provision of ple, inexpensive, and highly efficient in the performance of all classes of work done on shaping and similar machines.

With the above and other objects inv view, the invention consists in a tool holderv having adjustable bufling means to vlimit the swinging movement thereof during its return or idle stroke.

It also consists in the` provision of 'a holder wherein the tool'extends forwardly beyond any portion of the holder or parts of the machine movable with the holder.

It further consists in the construction of a tool yholder so arranged that it is Vparticularly adapted for die cutting and the cutting of slots in work pieces, while retaining its effectiveness for cutting exposed surfaces of work pieces inythe usual manner; and it further consists in the novel features of construction, and in the arrangement andV combination of parts to be hereinafter described and particularly pointed out vin the subjoined claims.

' In the drawingsf- Figure 1 is a side elevation of a portion of i a shaping machine showing a work piece in section clamped therein and the tool of my improved holder in the act of cutting a slot or machining a slot or opening within the Y' Y work piece. Y Y

Fig. 2 is a front elevation of my improved tool holder detached from the machine with the cutting tool removed therefrom! a tool holder which is sim- Fig. 3 is a section taken on line a-fa, Fig.V

2, with a tool clamped within the holder.`v

Fig. 4 is a section taken on line b-b, Fig. 2, with the lower and upper vporti'onsiof the buging device shown'in elevation.

i taker? on line c-c, Fig. 1. Y

Fig. 6 is a transverse s ction taken'on line d-LZ,Fig.8. Y' FiO. 7 is a detachedy perspective view of'a Y portibn of the tool-clamping mechanism. Y

5 is an enlarged horizontal-section ard# or frame-of a? 'shaping machine, 2y theram o'r't'ool lcari'ying slidey which i's recti-' linearly movabl'einlthe''usua'l mannenand 3' the' we'rliiy ftahle' ha-ving'- af' prtion 4% movable laterally-and ai 'II'JOIlv 5 nibvableV vertically.- 6 designates the work holding jaws adjust,- able relatively inia'ny commonm-uiner and havinga` work piece lheidtherebetween, said worlpi'ecehaving a lslot or? opening 8 shown -therein,"representing one of 'many kinds-"of lwerk for'fwhieh this' invention is particularly adapted. rSecured?ttlfieiirnt-end off the'y ram is the tool" head' 9 havingthes'wivel head l0 secured-th'ereto in" the usual manner', said swivel; head@ havi'ngi the usualr` pivote-dr apron 11 attached thereto. This swivelV 'head is diiierently shaped' in machinesof different makes', but invariablythe'port'ion to which the apron 11@- ispivoted projects forwardly from the? segmental' upper' portion l2 of the Swivel head-L 1 The parts thus fai-described form no portion of' my inventionl and 'are' illustrated merely' `for the purpose of more clearly disclosingc the operationV and advantages? oi" my improved holder. y v f My improved tool'holder comprises a tool'- hold'ing' member or 'body portionv 13' which preferablyy has a' widefparallel'esided upper portion1 14' 'and a'tapered lower portion' 15; For convenience in securing the'tool l'io'ld'er to the pivoted apron of theswivel head, it is provided with a vbolt hole 16y through 'which y bolt' lisfpassed which threadsf into' a l'angedfbushing-"18 fitting" into a" counterhored'openi'ngflfQl 'forme inthe pivoted aprong"asbestishown' in Fig. 5, the enlarged portion of said openlng being at thefrear-of Vs ai'd apron-snthatI-whenfthe bolt 1^? is'. threaded?intoisaidbushingthe latter is drawn forwardly,v the ia'nge-y off said bushing-- serving a's a stop and' assuring af'secureattachment of the''hodyA portion130i?` said@ holder tojsaid pvote'd apron. f '20: is. 'a' washerittingaround the bolt 11"`c`lampedbetween thehead thereof and the frent'fa'ce ot said' body portion. y @The toolfhl'der isi "provided with a'nfl obliquely-disposed slot 2:1arrangedi-n its lower ing flangeS22J iis formed ontheffront Vface of Said body portion, the inner surfaces of said flange forming continuations of the walls of thereoffand' inf order to effectively clamp' said shank, thelower end? or edgeof said: clamping member 23 is provided with a lonlr gitud-'inalV V-shaped groove 26 whereby two contactr or bearing surfaces 27, '28,* are, pro vided ,these contact or bearing surfacesbel ing adapted tol engage the cylindrical shank of thecutt-ing vtool and clamp the latterV firmly within said slot. 'This cutting tool Y may be flattened forward of said cylindrical sha-nk, as at 29, and' given any desired cutting edge, depending onthe 'particular work it is to perform. By' thus arranging the tool' receiving slotand the clamping member, the cutting 'tool extends forwardly, anyy desired distance; from the front face of the bodyl portion 13,"an-df'the cutting tools may be forged' or otherwise'worked from cylindrica'lbars, which are comparatively cheap andprovide the tool with therequired shank without resortingrtomachine work'for producingf' the latter. Y

Extending obliquely through the body portion 13 on the line ofsaid tool-receiving slot 21" is a' bore 30, said bore extending from the upper end of said sloty tojthef upper edge of the 'body portion andfhaving its lower or inner extremity"V reduced in diameter, as at 31, to provide an upwardly facing shoulder 32., A'push pin or rod is enteredinsaid` bore 30 and has a i'ree sliding ht' within the'reduced portion 32 of said bore, the lower or inner endA ofs'aidrod' being threaded intov the clampingl member '23', as at 34. Saidp'ush'pin orrod has-an enlargement'y orI hea-d 37 at its upper end against which one endof an expansion coil spring. 35fbears', which" spring lsurrounds said push'pin and has itsother end' bearingagainst the shoulder 32.- `The the bore 30 is vthreaded and receives ase't screw l 36' which bears against the' upper face of" the enlargement or head 370i said push pin or' rod.

` Asshown in-v Figs. 3"-a'ndf 8, the'set'screw 36 has 'been' screwed"inwardly"andl has-'forced the' push pin/33 and" clamping member 23 downwardly, with' "the result f that said clamping'-mem'ber has Yeffectively clamped the shank of the 'cutting toolV 29.1111 orfder to releasesaid'euttingtool it is simply nec# ing essary to slightly unscrew the set screw 36, whereupon the coil spring 35 surrounding said push pin, acts to raise the latter and with it theclamping member. This will permit the ready withdrawal of the Vtool from the holder. When the tool is removed `from the holder, the clamping member is retained in position within the tool-receiving slot 21 with its V-shaped groove in receiving position, thus it is only necessary to insert the shank of the cutting tool into the lower end of the slot, and upon screwing the set screw downwardly the tool will again be clamped. I will now state, that owing to the lower end of the tool-receiving slot being rounded and the lower edge of the clamping member being Vprovided with av V-shaped groove, cutting tools having different sized cylindrical shanks may be clamped in position, and the arrangement provided also enables cutting tools having dierent shaped shanks to be used in connection with this improved holder.

During the forward or cutting movement of the tool holder, the cutting tool is held in` a rigid manner, and byreason of the tool being practically a straight member without angular portions, it is entirely free of vibrations.

During the return movement of a tool holder, it is necessary that the cutting edge of the tool passes idly over the surface of the work piece operated upon, and for this reason the tool holder of a shaping or similar machine is invariably attached to a piv- 'oted apron, such as shown at 11, in the drawings; consequently the apron will swing forwardly stroke, and when operating the ram quickly, this swinging movement creates considerable noise. Moreover, it is oftentimes found that the apron has not fully recovered itself when commencing the next forward cutting stroke and the work to be performed will therefore be imperfect. To avoid this I have provided the body portion with a bufling device 38 which comprises an upstanding bar 39 hava reduced lower end 40 tting into a socket 41 formed in the upper end of the body portion 13 of the tool holder, said bar being secured within said socket by means of a set screw 42 threaded Vinto a tapped opening 43 extending from said socket 41 outwardly to an enlarged opening or pocket 44, the outer end of said set screw terminating within said pocket so that it is entirelyY all projecting parts at this point.

Projections at the side edges of the tool holder are undesirable since they tend to interfere with proper and free working conditions.

-paratively -end and with internal screw 56 which is tapered at its ybuHer pin 58 is slidable within said .bore and has its outer end rounded, as at 59.

on its pivot during such return 1 ally kThe upper end of the bar 39 is' slotted, asl Vat 45, the lower portion of the slot being enlarged `and of cylindrical formation, as at 46, and -having a narrow slit 4T' extending downwardly therefrom.

48 designates a bar or link, which is comlat and the lower end of which enters the slot 45. The two jaws 49 at .op-

Vposite sides of saidslot therefore lie against opposite faces of said bar or link 48 and are firmly clamped against such faces by a bolt 50 which passes through openings in one of e said jaws and in said link, and takes into a threaded `opening in the other jaw. By loosening said bolt, the bar or link 48 may be swung at any angle with reference to the 4bar 39, as indicated in Figs. 3 and 4.

A buffer head 51 is provided which has a cylindrical Vbody portion or cylinder 52 provided with a latextension or lug 53 at one its other end, said threads receiving the threaded inner end 55 of a buer pin guide outer end and provided with an axial guide bore 57. A

guide The outer end of said buffer pin normally projects beyond the outer end of said guide and its inner end is provided with a fiat head 60 against which one end of a coil spring 61 bears; said spring being situated within said body portion orcylinder 52 and having its other end bearing against the end wall 62 of said cylinder. Said spring therefore serves to hold said buEer pin in projected position.

The upper end of the link or pin 48 is pivotally connected to the at extension or lug l53 of the body portion or cylinder of said buffer head by a bolt 63 which passes through an opening in said bar or link and is threaded into an opening in said extension or lug. The bar or link 48 being pivotconnected to the upstanding bar 39 and to the buffer head .enables said buffer head to be moved to different points with reference to the position ofthe body portion 13 of said tool holder ;l and said buffer head, while intended to be retained in a horizontal position, may be arranged at an angle to the horizontal when it is found that the machine to which the tool holder is applied will not permit of its being retained in horizontal position.

In Fig. 1 the buffer pin is shown in contact with the front on the swivel head 10, but it isv apparent that said pin need not necessarily engage this particular part of the shaping machine, as any other fixed point, whether fixed by adj ustnient or permanently fixed, may ber-so en aged.

uring the return movement of Ethe tool holder, during which the'pivoted apron 11 swings forwardly or tends to swing forwardly, the spring 61 in the buffer head Voffers the necessary resistance to such actionvand allows only the slight movement threads 54 at face of the segment 12v tool holding member,

too'l holding tool' iolding ngz.

of )the pivoted apron necessary to permit the tool to clear the work piece, the spring acting to immediatelyseat` the pivoted apron when lthe' return movement ceases; consequently" the cutting toolv is in the prol er position for vvcutting immediately the fierward or `cutting movement commences. v

My improved tool holder is susceptible of various'jch'anges vin construction without departing from the spirit of my invention or sacricing'any of the advantages thereof, as will beelear lfrornthe scope of .the appended claims. Having thus 'described what claim is f f l. Af cutting-tool holder comprising la and a bufling device extending"'fromv said tool 'holding member "anddiaving a pluralityo'f pivotally' conneeted parts' adjustable to different angles with respect to each other and a" springpressed; buffing member extendingl from, 'one of said 'con'nectedl parts'and adapted for engagement with a ,fixed part of the mamy invention,

c fhine'tf'i which said cutting tool holder' is secured.

A cutting-tool 'holder'comprising a tool holding member, and a bulng' vdevice comprising a bar rigidly secured to 'said tool holding member, a link pivotally conneoted at one end withI the outerl end of said baranda buferA head pivotally connec'ted to the opposite, end of said link. 3. A cutting-tool holder comprising a member, and a buiing device comprising bar vrigidly secured to said member,a link pivotally oonnected at' one end with the outerl end of said'bar'. and af buffer head pivotally con- 1i'eete`d' to the opposite end ofjsaid link, said buffer head having a 'tending therefrom to engage a fixed object.

spring-pressed pin ex,-

4; A cuttingltool yholder comprising a tool device extending upwardly rfrom said' tool holding' member andeompo'sed of a rigid bar secured to said prising a plurality toolholding member, a link pivota'lly connected at it'slowerend to the upper end of saidfrigid bar, a cylinder pivotally connected to the upper endoi' said link, a spring within said cylind`e1, fa`nd a buffer Apin extending from said cylinder and being retained' in its spring. l

5. A cutting-tool holder'c'omprisin'g a tool projected position by said holding member, and a bling device comof connected members and buffer head, said 'buffer head being lcapable of being retained in horizontal' positi'on and being adapted tobear against a fixed part of thev machine to whichsaid cutting-tool holder issecured.

e. ,A (setting-tool helder comprising a e001 'holding member, and a buiiing device extendingy fromI saidy tool holding member and "may mitre', levierl lciam'ping mm-bef ing member having a parallelsifde u having aA buffer member at. its-extremity, said builer member beingradjustablesothat it maybe positioned at dilerentrheights with reference-Ito the upper edge of said tool holding 'member.`-V Y l Y 7. A cutting-tool holdercomprising a tool holding member, arigidbar extending upwardly from said-"tooly holding member and having afforked upper Iend, a linkpivo tally connected atone xendlto Lthei'orked upper end of '.saidb'arf, land a Lbuffer 'head pivotally connectedjto the .upper end of' said link, said bi1-iler-v 'head vhaving af springp'ressed .buffer pin projecting therefrom.

8; A- cuttingftoo'l holder cm'prisingai tool holding member, .and a bufln'gl device 'composed of a plurality of pivotally-'connecte'd members, one ofsaidpivotally-connected members includinga cylinder, a duid-e memb'er'tlireaded'into oneend: of saidbcyli'nder, a buffer pin within' said guide member and projecting from'theouter end o'f thelatter, and a spring between said buder'pinland the vinner end wallI of 'oylinder;V

9.' cuttingetool-holder' cmprising tool holdin member having an upwardlyv 'opening soc iet anda laterally opening threaded bore provided with air unthreadedenlarged vouter `end portion, a bar fitting 'withits lower end into.D said socket,-a` 'set' screw threaded intoA said A threadedI bore and bearing with itsinner end against the lower-'end of said bar within socketand terminating with its outer end within the 'enlarged outer end portion of said bore, a link. pivotally eonnectedl to the' upper end of said bar, and a buffer head pivotally connected tothe upper endof said link. f

,'10. A cutting'ftoo'l' holderfcomprisinga toolholding member,`- an d af builng device extending froml said Vtool holdingmember and having a buffer" pin at. its' extremity, said bufing device being -adjustable to enable-the Gehege-Irgend Vor Saidy buserrpia to minating Witllits lowe'rl en 'df'in close proxi end of said member, a

between* which 4afndthe. lower 'end "of said slot aI tooly is?'adaptedltel be held, andmeans for movin f said 'i ,clamping meinbeif into clamping in'said j'nositin v 4 1211i a leiitti ng-'tool holder, atoolfhldpre1 portion and tapered lower portion, means forsecuring' saidinember' at" a peint between its'nppe'and lwer ends t'the lsWinging apronof a shaping orother machine, said ytool holdingmember having an bliquelydisposed slot' ther-iin,l a. clamping member withinsaid slet, afpia @seared @ossia 'damp movable within said slot ing member and spring-pressed to move said clamping member out of clamping position, and means engaging said pin for moving the latter and said clamping 'member into clamping position.

13. A cutting-tool holder comprising a tool holding member having a parallelsided upper portion and a tapered lower portion provided with an obliquely-disposed slot terminating in-close proximity to the lower end of said tapered portion, said member having a bore extending from the upper end of said slot to the upper edge of said member and said bore having its lower end diminished in diameter to provide an upwardly-facing shoulder, a clamping member within said slot, a pin secured to said clamping member and extending into said bore, said pin having an enlargement at its Copies of this patent may be obtained for upper end, a .coil spring surrounding said pin andbearing at its lower end against said upwardly-facing shoulder and at its upper end against the underside of the enlargement of said pin, and a set-screw threaded into the upper end of said bore and bearing against the upper side of said enlargement.

14. A cutting-tool holder comprising a tool holding member provided with an elongated slot and a flange extending forwardly therefrom entirely around said slot to increase the depth of said slot beyond the depth of the tool holding member, a tool clamping member within said slot, and means for moving said clamping member into clamping position.

In testimony whereof I aix my signature.

JOSEPH C. BRUNO.

five cents each, by addressing the Commissioner of Intenta,`

Washington, D. 0. 

